Passing data between directives and controller in Angular

I'm just working on a projet in Angular 1. The task is to do a DOM tree from json object and manipulate with it through native drag'n'drop DOM operations (with out jQuery and etc). I've been done parsing json-> dom function, loading json from server, some drag'n'drop event handlers. Now my question is how to update a json object (from this object I get a ul>li tree structure) when I done a DROP event.
Now, code

So, In Sup directive when drop event created, and I'm reinit treeJson variable, after that I need in main directive reinitializing the tree and also in controller get new json structure from this variable, because $watch is used, but it isn't happened.